Where do I switch data confirmation submission message on/off?

In order to switch the toggle for 'confirmation message' to be on or off, first select 'Onboarding Types' in the 'Prospect Onboarding' drop down.

Then select the Onboarding type in which you wish to adjust the confirmation message for.

From here, you will be presented with a variety of customisable messages, one of which being the 'confirmation message' which you can flick the toggle to either enable or disable.